Andrew Hayworth e63ac871f8 MINOR: log: Add log-format variable %HQ, to log HTTP query strings
Since sample fetches are not always available in the response phase,
this patch implements %HQ such that:

  GET /foo?bar=baz HTTP/1.0

...would be logged as:

  ?bar=baz
2015-08-09 10:16:49 +02:00
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